AWS durable-functions documentation change
Summary
File was moved from core/parallel.md to sdk-reference/operations/parallel.md and navigation structure was updated to reflect new documentation organization with updated breadcrumbs, sidebar, and header links.
Security assessment
This change is purely organizational/structural documentation restructuring. It involves moving the file location and updating navigation links, breadcrumbs, and sidebar hierarchy. There is no mention of security vulnerabilities, security features, or any security-related content changes in the provided diff. The changes are focused on documentation navigation and categorization.